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In this work, a waveguide slotted antenna array working in the sub-millimeter wave band is presented. The antenna performs beam tilting from 68 to 89 degrees in the H-plane while sweeping the frequency from 240 GHz to 310 GHz. Sixteen rectangular slots have been cut in the wide surface of a standard WR-3 brass metal rectangular waveguide to obtain the desired behavior. The antenna has been fabricated...
A lightweight portable planar slot array antenna at X-band for fixed satellite communications is presented in this letter. The terminal is composed of two radial-line slot antennas (RLSAs) with the slots placed on the upper layer in spiral: one for reception (RX) band with left-handed circular polarization (LHCP), and the other one for transmission (TX) band with right-handed circular polarization...
In order to easily introduce a scanning probe for data acquisition in microwave imaging systems, a frequency steering microstrip antenna array operating from 15 to 18 GHz has been proposed. Aperture coupled microstrip antennas have been used as individual radiators in order to avoid the detrimental influence of the spurious radiation produced by the feeding network. The behaviour of the antenna has...
A transmitting polarisation agile antenna based on injection locked oscillators has been presented. This phase shifting circuitry presents advantageous properties, such as relatively high power, ease of control and continuous phase shift range. A prototype of the system has been manufactured, providing a continuous range of polarisation variation including two linear and two circular polarisations.
A design of a receiving 4x1 element phased antenna array based on Mutually Coupled Third Harmonic Self-Oscillating Mixers has been presented. The use of the third harmonic of the self-oscillation allows higher beam steering angles without extra circuitry showing the potential these multifunctional circuits have. The experimental behavior obtained with the receiving phased antenna array has been compared...
A receiving 4 x 1 element antenna array based on injection-locked harmonic self- oscillating mixers has been presented. With the proposed topology, coupling problems between different IL3HSOM circuits, sometimes present in oscillator based phased array systems, have been avoided by filtering without affecting the IF output power of the phased antenna array. Using a progressive phase-distribution along...
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